Editorial: use sentence case for "Animation frames"

j9t · annevk · commit b5dd8520fd16 · 2017-08-14T17:02:42.000+02:00
Fixes whatwg#2914.
diff --git a/source b/source
@@ -93468,7 +93468,7 @@ loadMySprites().then(runDemo);</pre>
 
 
 
-  <h3>Animation Frames</h3>
+  <h3>Animation frames</h3>
 
   <p>Each <code>Document</code> has a <dfn>list of animation frame callbacks</dfn>, which must be
   initially empty, and an <dfn>animation frame callback identifier</dfn>, which is a number which
